John Callahan may refer to:
- John Callahan (actor), best known from the popular soap opera All My Children
- John Callahan (cartoonist), cartoonist
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- John Callahan's Quads!, a 2001 animated television series
- Pelswick, a 2000 animated television series
- John Callahan (Wisconsin politician), Wisconsin Superintendent of Public Instruction
- John B. Callahan, mayor of Bethlehem, Pennsylvania and Democratic nominee for the U.S. House of Representatives
- John F. Callahan, writer and editor of numerous volumes related to African-American literature
- John H. Callahan (1845–1914), American Civil War soldier and Medal of Honor recipient
- John M. Callahan, Chairman of the Democratic Party of Wisconsin
- John Ross Callahan (1853-1918), pioneer in the field of dentistry and particularly dental research
- John Callahan (catcher) (1878-1952), American baseball player
- John Callahan (pitcher) (1875-?), baseball player
Famous quotes containing the words john and/or callahan:
“How soon I may ride the whole world about;
And at the third question thou must not shrink,
But tell me here truly what I do think.””
—Unknown. King John and the Abbot of Canterbury (l. 30–32)
“Forget dating. Forget striking a balance between work and family. Most single parents, whether they are divorced, widowed, or single by choice, report that discipline is by far the toughest issue.”
—Jean Callahan (20th century)